Wiggler.



R. GUOPBR.

WIGGLER.

APPLICATION FILED SEPT. 20, 1913.

1,109,625: Patented Septl, 1914.

.ROBERT COOPER, OF DETROIT, MICHIGAN.

`WIGGLER.

Specification of Letters Patent.

Patented Sept. 1f? 1914.

Application led September 20, 1913. Serial No. 790,853.

7 '0 all whom 'it may concern Be it known that I. ROBERT Coornma subject of the King of Great Britain, residing at llctrohin the county of Vayne and State of lilichigan. have invented certain new and useful Improvements in IVigglers, of which the tollmving is a specification, reference being had therein .to the accompanying drawings.

This invention relates to a. milling inachiue wiggler and drill chuck, and more par-f ticularly to a machinists tool for expeditiously and accurately centering a piece of workwhereby it can be properly drilled and operated upon.

It is usual to mark the center of a hole to be drilled with a center punch and enter the point of the drill in the mark or indentation so made. A common ,way of securing accuracy is to adjust a pair of compasses to the radius of the drill, then after the center is.

pricked on the metal to be drilled to mark a circle equal to the circumference of the drill around said center with the Compasses. T he metal is often chalked so that the circle may be marked thereon and easily observed.

To determine when a 'piece of work is properly7 centered in a machine, after the work has once been laid out, I have devised a simple and inexpensive tool wherein positive and reliable means are employed, as hereinafter set forth. for holding a needle point or wiggler inthe center punch mark or if desired in any adjusted position, whereby a circle may be quickly described in proximity tothe surface of a piece of work to be operated upon or if centered in the punch mark the degree of wabbling will indicate the extent that the work is out of line.

My invention further aims to provide a milling lnachine wiggler with an invertible needle or indicator that can be'housed within the. holder whereby the device can be safely carried in a grip or in the pocket.

The above and other objects are accoinplshed by a mechanical construction that will be hereinafter specifically described and then claimed.

Reference will now be had to the drawing, wherein- Figure 1 is a side elevation of a tool in accordance with this` invention; Fig. 2 is a longitudinal sectional view of the same; Fig. 3 is a side elevation of a detached guide; Fig. at is a side elevation of the detached needle or indicator, and Fig. -5 is a side elevation of a spindle of the holder.

The device comprises a cylindrical spindle 1 having the outer end thereof provided with vcollars or enlargementsQ and 3, the collar 3 beingr exterorly screw-threaded, as at 4. The spindle l has a longitudinal bore 5 extending from the outer end thereof to a point in close proximity to the inner end of said spindle. The outer end of the bore 5 is enlarged, within the collar 3, to provide a socket 6.

Screwed upon the threaded collar 3 is a metal lock or jam-nut 7 and a spindle sleeve S, said sleeve having the outer end thereof contracted or tapered to provide an annular beveled seat 9 that has` its walls inclined toward the outer end of said sleeve and the longitudinal axis of the device.

Extending into the socket ofthe spindle is a tubular guide 10 having a bore 11 longitudinally alining with the bore 5 of the spindle. said bore having substantially the same diameter as the bore 5; The outer end of the tubular guide 10 has a head 11aL providing an annular shoulder 12 and engaging said shoulder is the outer convolution of a coiled compression spring 13 arranged ywithin the socket (i and encircling the inner end of the guide 10. The outer end of the head 11a has a concavcd scat 14 for a spherical body or ball 15 that also engages the seat 9 of the sleeve 8. The spherical body 15 has a socket 1G and lnounted in said socket is the inner endof a needle or indicator 17. In some instances, the needle or indicator can be formed integral with the spherical body or ball 15.

The tension of the spring 13 holds the tubular guide 10 against the spherical body 15 and said body frictionally against the scat 9. The tension of the spring 13 can be increased by adjusting the sleeve 8, in

which instance, the spherical body 15 is forced inwardly and the guide 10 forced farther into the socket 6, thereby placing the spring 13 under greater tension. `With the needle or indicator 17 frictionally held, it is possible to swing the same out of aline ment with the longitudinal axis of the device, such position being indicated by dotted lines in Fig. 1.

After a circle has been described upon a piece of work, the sleeve 8 can be nnscrewed and the needle indicator removed and a drill substituted therefor.

-end of said sleeve,

Aa guide From the foregoing it will be observed that after the end of the needle'is placed in the center marl: of an improperly positioned piece of work that said needle will wiggle and thereby indicate that the piece of work is ell center and must be trued up befored rillin g. i

It is thought that the utility of the combined milling machine wiggler and drill holder will be apparent without further description, and while one embodiment of my invention has been illustrated, it is to be understood that the structural elements are susceptible to such variations and modifica'- tions as fall Within the scope of the appended claims.

What I claimas my invention is 1. A milling machine wiggler, comprising a spindle having a longitudinal bore formed therein terniinating in a socket in the o'uter end of said spindle, a sleeve screwed upon the outer end of said spindle and provided with a contracted end, an invertible needle' capable of being housed in the'longitudinal bore of said spindle and having a spherical body detachably seated in the contracted and tension means arranged Within the socket of said spindle and engaging the spherical body of said needle for frictionally holding said needle in anadjusted position;

2. A milling machine wigglercoinprising a spindle having the outer end thereof provided with a, socket, a sleeve adj ustably mounted upon the outer end of said spindle and provided with a contracted end. a needle having the inner end thereof frictionally held in the contracted end of said sleeve,

engaging the inner end of said needle and extending into the socket of said spindle, and means encircling said guide arranged wit-hin said socket and engaging the said guide for holding said guide normally in engagement with the inner end of said needle.

3. A milling machine Wiggler comprising a spindle having the outer end thereof provided with a socket, a sleeve adj ustably mounted upon the outer end of said spindle, a needle. having the inner end thereof detaehably seated n said sleeve, a tubular spring encircled guide dctachabl i mounted in the socket of said spindle for rictioually engaging and holding the inner end ol' said needle in engageinent with said sleeve.

4. A- milling machine wiggler comprising a spindle having the outer end thereof provided with a socket, a sleeve screwed upon the outerend of said spindle and provided with a contracted end, a nutscrewed upon said spindle against said sleeve, a needle having the inner end thereof seated in the contracted and of said sleeve, a tubular guide arranged in the socket of vsaid spindle and said sleeve for engaging the inner end of said needle, and mansinterposed between said guide and said spindle for holding said guide normally in engagementwith the inner end of said needle.

5. A milling machine wiggler comprising a spindle having a longitudinal bore terminating in a socket at the outer end of said spindle, a sleeve screwed upon the outer end of said spindle, and having a contracted outer end, a needle having the inner end thereof seated in the contracted end of said sleeve, a guide arran against the inner end f said needle, said guide having a bore longitudinally alining with the bore of said spindle and coperating therewith to receive said needle when ed in said sleeveI inserted and housed by said spindle and saidsleeve, and means arranged in the socket of said spindle and adapted to hold said guide normally in engagement with the inner end of said needle.

In testimonywhereof I aliix my signature in presence of two witnesses.

ROBERT COOPER. lVitnesses ANNA M. Donn, E. R. BARRETT. 

